Open-label, multi-center, phase III trial. Oral treatment with 1500 mg norucholic acid in Primary Sclerosing cholangitis

Inclusion criteria:

1. Signed informed consent.
2. Males or females ≥ 18 years.
3. Patient has previously been diagnosed with PSC, has participated in the previous NUC 5/PSC trial and has completed the DBE phase with Visit 22, or has prematurely terminated the DBE phase before this trial has been started, or has prematurely terminated the DBE phase after this trial has been started, under the condition that the premature termination was due to lack of efficacy*. (*Lack of efficacy as defined in the NUC-5/PSC trial.)

Exclusion Criteria:

1. History or presence of chronic alcoholic consumption (daily consumption > 30 g in men, > 20 g in women).
2. Patients who discontinued study participation in NUC-5/PSC due to an AE possibly caused by the study drug.
3. Liver Cirrhosis or any cirrhosis-related symptoms which in the opinion of the investigator may affect the patient's safety.
4. History of liver transplantation or patient listed for transplantation.

It is not decided which data will be made available. A time frame cannot be indicated yet.